Monitor remote machine's memory using Nagios Core

[slansing]

You should be able to get a bit more info out of the remote host's syslog, for centos/rhel the syslog is normally in the below location, please share the output of this command:

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tail -50 /var/log/messages

[vinothsethuram]

Dec 12 11:33:46 nagios kernel: type=1400 audit(1386866026.908:29795): avc: denied { module_request } for pid=16153 comm="httpd" kmod="net-pf-10" scontext=unconfined_u:system_r:httpd_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=system

[slansing]

There was absolutely nothing else in your syslog besides on entry at "Dec 12 11:33:46"? Are you sure?

[vinothsethuram]

Then there was no inform about connection refused in the logs.

[abrist]

Dec 12 11:33:46 nagios kernel: type=1400 audit(1386866026.908:29795): avc: denied { module_request } for pid=16153 comm="httpd" kmod="net-pf-10" scontext=unconfined_u:system_r:httpd_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=system

This is an selinux context error. Is selinux enabled?

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getenforce

[vinothsethuram]

If I run the above command , I'm getting output as "Permissive"

[lmiltchev]

Run the following command and show the output:

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iptables -L -n | grep 5666

[vinothsethuram]

-bash-4.1# iptables -L -n | grep 5666
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:5666
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:5666

[sreinhardt]

From the nagios system run:

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nmap -p 5666 [Hostname\IP of the remote system]
(Please be sure to enter your host\IP not just copy paste, it also cannot be localhost)

On the remote system that you have installed nrpe on, and want to monitor the memory run:

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service xinetd status
ps -ef | grep nrpe
ps -ef | grep xinetx
netstat -naop | grep 5666

[vinothsethuram]

Do I need to install nrpe in remote system too?